Question

If the radius of the circle is 4 cm, find its circumference. [Use 3.14 for π.]

Answer 1

$r=4 \ cm \\ \pi=3,14 \\ \boxed{C-?} \\ \bold{Solving:} \\ \boxed{C=d \cdot \pi=2r \cdot \pi} \\ C=2 \cdot 4 \ cm \cdot 3,14=8 \cm \cdot \pi \\ \Rightarrow \boxed{C=25,12 \ cm}$

Answer 2

Circumference = 2πr = 2*3.14*4 = 25.12